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psyc://psyced.org/~lynX 2011-05-24 20:15:52 +02:00
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11 changed files with 156 additions and 82 deletions
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1
bench/.gitignore vendored
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@ -1,3 +1,4 @@
*.html
*.pdf
results/
packets/binary/[0-9]*

2
bench/Makefile
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@ -7,7 +7,7 @@ INIT = (setq load-path (cons \"/usr/share/emacs/site-lisp/org-mode\" load-path)
org-babel-tangle-pad-newline nil \
org-src-preserve-indentation t) \
(require 'org-install)
#'
ORG = benchmark.org
html:

150
bench/benchmark.org
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@ -25,8 +25,9 @@ Here's a way to model this in PSYC:
** A message with JSON-unfriendly characters
This message contains some characters which are
impractical to encode in JSON. Let's see how much
performance impact this has.
impractical to encode in JSON. We should probably
put a lot more inside to actually see an impact
on performance.
#+INCLUDE: packets/json-unfriendly.xml src xml
#+INCLUDE: packets/json-unfriendly.json src js
@ -34,7 +35,8 @@ performance impact this has.
** A message with XML-unfriendly characters
Same test with characters which aren't practical
in the XML syntax.
in the XML syntax, yet we should put more of
them inside.
#+INCLUDE: packets/xml-unfriendly.xml src xml
#+INCLUDE: packets/xml-unfriendly.json src js
@ -129,26 +131,90 @@ We'll use the latter here:
Parsing time of 1 000 000 packets, in milliseconds.
a simple strlen scan of the respective message is provided for comparison.
| input: | PSYC | | JSON | | | XML | |
| parser: | strlen | libpsyc | json-c | json-glib | libxml sax | libxml | rapidxml |
|-----------+--------+---------+--------+-----------+------------+--------+----------|
| user prof | 55 | 608 | 4715 | 17468 | 7350 | 12377 | 2477 |
|-----------+--------+---------+--------+-----------+------------+--------+----------|
| / | < | > | < | > | < | | > |
| input: | PSYC | | JSON | | | XML | |
| parser: | strlen | libpsyc | json-c | json-glib | libxml sax | libxml | rapidxml |
|-----------------+--------+---------+--------+-----------+------------+--------+----------|
| user profile | 55 | 608 | 4715 | 16503 | 7350 | 12377 | 2477 |
| psyc-unfriendly | 70 | 286 | 2892 | 12567 | 5538 | 8659 | 1896 |
| json-unfriendly | 49 | 430 | 2328 | 10006 | 5141 | 7875 | 1751 |
| xml-unfriendly | 37 | 296 | 2156 | 9591 | 5571 | 8769 | 1765 |
|-----------------+--------+---------+--------+-----------+------------+--------+----------|
| / | < | > | < | > | < | | > |
| | <r> | <r> | <r> | <r> | <r> | <r> | <r> |
Pure syntax comparisons above, protocol performance comparisons below:
| input: | PSYC | | JSON | | | XMPP | |
| parser: | strlen | libpsyc | json-c | json-glib | libxml sax | libxml | rapidxml |
|-----------+--------+---------+--------+-----------+------------+--------+----------|
| presence | 30 | 246 | 2463 | 10197 | 4997 | 7557 | 1719 |
| chat msg | 41 | 320 | | | 5997 | 9777 | 1893 |
| activity | 42 | 366 | 4666 | 16846 | 13357 | 28858 | 4419 |
|-----------+--------+---------+--------+-----------+------------+--------+----------|
| / | < | > | < | > | < | | > |
| input: | PSYC | | JSON | | | XMPP | |
| parser: | strlen | libpsyc | json-c | json-glib | libxml sax | libxml | rapidxml |
|-----------------+--------+---------+--------+-----------+------------+--------+----------|
| presence | 30 | 236 | 2463 | 10016 | 4997 | 7557 | 1719 |
| chat msg | 40 | 295 | 2147 | 9526 | 5997 | 9777 | 1893 |
| activity | 42 | 353 | 4666 | 16327 | 13357 | 28858 | 4356 |
|-----------------+--------+---------+--------+-----------+------------+--------+----------|
| / | < | > | < | > | < | | > |
Parsing large amounts of binary data. For JSON & XML base64 encoding was used.
Note that the results below include only the parsing time, base64 decoding was
not performed.
| input: | PSYC | | JSON | | | XML | |
| parser: | strlen | libpsyc | json-c | json-glib | libxml sax | libxml | rapidxml |
|---------+--------+---------+--------+------------+------------+-----------+----------|
| 7K | 92 | 77 | 14459 | 98000 | 11445 | 19299 | 8701 |
| 70K | 53 | 77 | 14509 | 1003900 | 96209 | 167738 | 74296 |
| 700K | 42 | 77 | 14551 | 10616000 | 842025 | 1909428 | 729419 |
| 7M | 258 | 78 | 14555 | 120810000 | 12466610 | 16751363 | 7581169 |
| 70M | 304 | 80 | 14534 | 1241000000 | 169622110 | 296017820 | 75308906 |
|---------+--------+---------+--------+------------+------------+-----------+----------|
| / | < | > | < | > | < | | > |
| <r> | | | | | | | |
These tests were performed on a 2.53 GHz Intel(R) Core(TM)2 Duo P9500 CPU.
* Criticism
Are we comparing apples and oranges? Yes and no, depends on what you
need. XML is a syntax best suited for complex structured data in
well-defined formats - especially good for text mark-up. JSON is a syntax
intended to hold arbitrarily structured data suitable for immediate
inclusion in javascript source codes. The PSYC syntax is an evolved
derivate of RFC 822, the syntax used by HTTP and E-Mail, and is therefore
limited in the kind and depth of data structures that can be represented
with it, but in exchange it is highly performant at doing just that.
In fact we are looking into suitable syntax extensions to represent
generic structures and semantic signatures, but for now PSYC only
provides for simple typed values and lists of typed values.
Another aspect is the availability of these formats for spontaneous
use. You could generate and parse JSON yourself but you have to be
careful about escaping. XML can be rendered manually if you know your
data will not break the syntax, but you can't really parse it without
a bullet proof parser. PSYC is easy to render and parse yourself for
simple tasks, as long as your body does not contain "\n|\n" and your
variables do not contain newlines.
After all it is up to you to find out which format fulfils your
requirements the best. We use PSYC for the majority of messaging where
JSON and XMPP aren't efficient and opaque enough, but we employ XML and
JSON as payloads within PSYC for data that doesn't fit the PSYC model.
For some reason all three formats are being used for messaging, although
only PSYC was actually designed for that purpose.
* Caveats
In every case we'll compare performance of parsing and re-rendering
these messages, but consider also that the applicative processing
of an XML DOM tree is more complicated than just accessing
certain elements in a JSON data structure or PSYC variable
mapping.
For a speed check in real world conditions which also consider the
complexity of processing incoming messages we should compare
the performance of a chat client using the two protocols,
for instance by using libpurple with XMPP and PSYC accounts.
To this purpose we first need to integrate libpsyc into libpurple.
* Conclusions
The Internet has developed two major breeds of protocol formats.
@ -166,46 +232,6 @@ combines the compactness and efficiency of binary protocols with the
extensibility of text-based protocols and still provides for enough
data structuring to rarely require the use of other data formats.
* Criticism
Are we comparing apples and oranges? Yes and no, depends on what you
need. XML is a syntax best suited for complex structured data in
well-defined formats - especially good for text mark-up. JSON is a syntax
intended to hold arbitrarily structured data suitable for immediate
inclusion in javascript source codes. The PSYC syntax is an evolved
derivate of RFC 822, the syntax used by HTTP and E-Mail, and is therefore
limited in the kind and depth of data structures that can be represented
with it, but in exchange it is highly performant at doing just that.
So it is up to you to find out which format fulfils your
requirements the best. We use PSYC for the majority of messaging where
JSON and XMPP aren't efficient and opaque enough, but we employ XML and
JSON as payloads within PSYC for data that doesn't fit the PSYC model.
For some reason all three formats are being used for messaging, although
only PSYC was actually designed for that purpose.
Another aspect is the availability of these formats for spontaneous
use. You could generate and parse JSON yourself but you have to be
careful about escaping. XML can be rendered manually if you know your
data will not break the syntax, but you can't really parse it without
a bullet proof parser. PSYC is easy to render and parse yourself for
simple tasks, as long as your body does not contain "\n|\n" and your
variables do not contain newlines.
* Caveats
In every case we'll compare performance of parsing and re-rendering
these messages, but consider also that the applicative processing
of an XML DOM tree is more complicated than just accessing
certain elements in a JSON data structure or PSYC variable
mapping.
For a speed check in real world conditions which also consider the
complexity of processing incoming messages we should compare
the performance of a chat client using the two protocols,
for instance by using libpurple with XMPP and PSYC accounts.
To this purpose we first need to integrate libpsyc into libpurple.
* Futures
After a month of development libpsyc is already performing pretty
@ -232,17 +258,19 @@ specialized parsers and renderers to be provided.
* Appendix
** Tools used
libpsyc:
*** libpsyc
: make bench
which uses the following commands:
: test/testStrlen -sc 1000000 -f $file
: test/testPsycSpeed -sc 1000000 -f $file
: test/testJson -snc 1000000 -f $file
: test/testJsonGlib -snc 1000000 -f $file
xmlbench:
*** xmlbench
: parse/libxml-sax 1000000 $file
: parse/libxml 1000000 $file
: parse/rapidxml 1000000 $file
See also "make bench"

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bench/packets/binary/json-footer Normal file
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@ -0,0 +1 @@
"}

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bench/packets/binary/json-header Normal file
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@ -0,0 +1 @@
{"data":"

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bench/packets/binary/psyc-content Normal file
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@ -0,0 +1,2 @@
:_foo bar
_data

0
bench/packets/binary/psyc-header Normal file
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bench/packets/binary/xml-footer Normal file
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@ -0,0 +1 @@
</data>

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bench/packets/binary/xml-header Normal file
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@ -0,0 +1 @@
<data>

74
test/Makefile
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@ -50,23 +50,6 @@ test: ${TARGETS}
x=0; for f in packets/[0-9]*; do echo ">> $$f"; ./testPsyc -f $$f | ${DIFF} -u $$f -; x=$$((x+$$?)); done; exit $$x
x=0; for f in packets/[0-9]*; do echo ">> $$f"; ./testPsyc -rf $$f | ${DIFF} -u $$f -; x=$$((x+$$?)); done; exit $$x
bench: bench-psyc bench-json bench-xml
bench-dir:
@mkdir -p ../bench/results
bench-psyc: bench-dir testStrlen testPsycSpeed
for f in ../bench/packets/*.psyc; do bf=`basename $$f`; echo strlen: $$bf; ./testStrlen -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf.strlen; done
for f in ../bench/packets/*.psyc; do bf=`basename $$f`; echo libpsyc: $$f; ./testPsycSpeed -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf; done
bench-json: bench-dir testStrlen testJson testJsonGlib
for f in ../bench/packets/*.json; do bf=`basename $$f`; echo strlen: $$bf; ./testStrlen -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf.strlen; done
for f in ../bench/packets/*.json; do bf=`basename $$f`; echo json-c: $$bf; ./testJson -snc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf; done
for f in ../bench/packets/*.json; do bf=`basename $$f`; echo json-glib: $$bf; ./testJsonGlib -snc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf-glib; done
bench-xml: bench-dir testStrlen
for f in ../bench/packets/*.xml; do bf=`basename $$f`; echo strlen: $$bf; ./testStrlen -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf.strlen; done
.NOTPARALLEL: nettestrun
nettest: nettestfull nettestsplit
@ -96,3 +79,60 @@ srvstart:
srvkill:
pkill -x testPsyc
bench: bench-genpkts bench-psyc bench-json bench-xml
bench-dir:
@mkdir -p ../bench/results
bench-psyc: bench-dir testStrlen testPsycSpeed
for f in ../bench/packets/*.psyc ../bench/packets/binary/*.psyc; do bf=`basename $$f`; echo strlen: $$bf; ./testStrlen -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf.strlen; done
for f in ../bench/packets/*.psyc ../bench/packets/binary/*.psyc; do bf=`basename $$f`; echo libpsyc: $$f; ./testPsycSpeed -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf; done
bench-json: bench-dir testStrlen testJson testJsonGlib
for f in ../bench/packets/*.json ../bench/packets/binary/*.json; do bf=`basename $$f`; echo strlen: $$bf; ./testStrlen -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf.strlen; done
for f in ../bench/packets/*.json ../bench/packets/binary/*.json; do bf=`basename $$f`; echo json-c: $$bf; ./testJson -snc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf; done
for f in ../bench/packets/*.json; do bf=`basename $$f`; echo json-glib: $$bf; ./testJsonGlib -snc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf-glib; done
bench-xml: bench-dir testStrlen
for f in ../bench/packets/*.xml ../bench/packets/binary/*.xml; do bf=`basename $$f`; echo strlen: $$bf; ./testStrlen -sc 1000000 -f $$f | ${TEE} -a ../bench/results/$$bf.strlen; done
bench-genpkts:
@${MAKE} genpkt header=../bench/packets/binary/psyc-header content=../bench/packets/binary/psyc-content bs=7000 of=../bench/packets/binary/7K.psyc
@${MAKE} genpkt header=../bench/packets/binary/psyc-header content=../bench/packets/binary/psyc-content bs=70000 of=../bench/packets/binary/70K.psyc
@${MAKE} genpkt header=../bench/packets/binary/psyc-header content=../bench/packets/binary/psyc-content bs=700000 of=../bench/packets/binary/700K.psyc
@${MAKE} genpkt header=../bench/packets/binary/psyc-header content=../bench/packets/binary/psyc-content bs=7000000 of=../bench/packets/binary/7000K.psyc
@${MAKE} genpkt header=../bench/packets/binary/psyc-header content=../bench/packets/binary/psyc-content bs=7000000 count=10 of=../bench/packets/binary/70000K.psyc
# @${MAKE} genpkt header=../bench/packets/binary/psyc-header content=../bench/packets/binary/psyc-content bs=7000000 count=100 of=../bench/packets/binary/700000K.psyc
@${MAKE} genb64 header=../bench/packets/binary/json-header footer=../bench/packets/binary/json-footer bs=7000 of=../bench/packets/binary/7K.json
@${MAKE} genb64 header=../bench/packets/binary/json-header footer=../bench/packets/binary/json-footer bs=70000 of=../bench/packets/binary/70K.json
@${MAKE} genb64 header=../bench/packets/binary/json-header footer=../bench/packets/binary/json-footer bs=700000 of=../bench/packets/binary/700K.json
@${MAKE} genb64 header=../bench/packets/binary/json-header footer=../bench/packets/binary/json-footer bs=7000000 of=../bench/packets/binary/7000K.json
@${MAKE} genb64 header=../bench/packets/binary/json-header footer=../bench/packets/binary/json-footer bs=7000000 count=10 of=../bench/packets/binary/70000K.json
# @${MAKE} genb64 header=../bench/packets/binary/json-header footer=../bench/packets/binary/json-footer bs=7000000 count=100 of=../bench/packets/binary/700000K.json
@${MAKE} genb64 header=../bench/packets/binary/xml-header footer=../bench/packets/binary/xml-footer bs=7000 of=../bench/packets/binary/7K.xml
@${MAKE} genb64 header=../bench/packets/binary/xml-header footer=../bench/packets/binary/xml-footer bs=70000 of=../bench/packets/binary/70K.xml
@${MAKE} genb64 header=../bench/packets/binary/xml-header footer=../bench/packets/binary/xml-footer bs=700000 of=../bench/packets/binary/700K.xml
@${MAKE} genb64 header=../bench/packets/binary/xml-header footer=../bench/packets/binary/xml-footer bs=7000000 of=../bench/packets/binary/7000K.xml
@${MAKE} genb64 header=../bench/packets/binary/xml-header footer=../bench/packets/binary/xml-footer bs=7000000 count=10 of=../bench/packets/binary/70000K.xml
# @${MAKE} genb64 header=../bench/packets/binary/xml-header footer=../bench/packets/binary/xml-footer bs=7000000 count=100 of=../bench/packets/binary/700000K.xml
bs = 1
count = 1
genpkt:
@[[ -n "${of}" ]]
[[ -f "${of}" ]] || ( \
cat ${header} >${of}; \
perl -le 'my @se=stat(q('${content}')); print $$se[7] + ${bs} * ${count} + 1' >>${of}; \
cat ${content} >>${of}; \
dd if=/dev/urandom of=${of} bs=${bs} count=${count} oflag=append conv=notrunc; \
echo -ne "\n|\n" >>${of} )
bs = 1
count = 1
genb64:
@[[ -n "${of}" ]]
[[ -f "${of}" ]] || (cat ${header} >${of}; dd if=/dev/urandom bs=${bs} count=${count} | base64 -w0 >>${of}; cat ${footer} >>${of})

5
test/testJsonGlib.c
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@ -32,7 +32,7 @@ void test_init (int i) {
int test_input (int i, char *recvbuf, size_t nbytes) {
JsonNode *root;
GError *error;
GError *error = NULL;
char *str;
size_t len;
int r, ret;
@ -41,8 +41,7 @@ int test_input (int i, char *recvbuf, size_t nbytes) {
if (!ret) {
printf("Parse error\n");
exit_code = 1;
return -1;
exit(1);
}
root = json_parser_get_root(parser);